Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.
1. as what someone cares about the most Your academic adviser should have your best interests at heart. I'm an English teacher at heart but also a writer.
2. in the most basic way He was at heart a conservative man.
1. Fundamentally, basically, as in He's a good fellow at heart. It was first recorded in Alexander Pope's Epistle to a Lady (1735): "But every Woman is at heart a Rake."
2. In one's deepest feelings, as a great concern, as in The governor has the party's best interests at heart. [Early 1700s]
In one's deepest feelings; fundamentally.